.~ Engages member coaxial with and rotatable relative to working member
DEFINITION
Classification: 92/17
(under subclass 15) Apparatus comprising an element having the axis thereof coinciding with the axis of the working member, said element being connected to the working member so that reciprocation of the working member effects relative rotation between said working member and element, and in which the movement preventing means is adapted to engage said element to prevent rotation thereof relative to said working member, and thereby prevent movement of the working member.
